Limits with errorbar

Community matplotlib-users
1

Dear all,

I am trying to make a plot with errorbars and upperlimits.
I’ve found the following pylab example http://matplotlib.sourceforge.net/examples/pylab_examples/errorbar_limits.html and it works fine both on a Mac OSX10.6 with python 2.6.1 and on Kubuntu 10.04 with python 2.6.5.

I’ve tried the to reproduce the example using matplotlib.pyplot but the limits do not show up, regardless of syntax or system (matplotlib 1.0.0 on Mac and 1.0.1 on Kubuntu)

I attach a sample code which does not work.

import numpy as np
import matplotlib.pyplot as plt

#create function to plot plus random error

x = np.linspace(0,3,100)
y = np.sin(x)
err = np.random.random(100)

plt.errorbar(x,y, yerr=err, color=‘g’,linestyle=‘None’,xuplims=True)
plt.show()

Does anyone know how to solve this problem?

Thanks in advance,
Francesco

2

Francesco Montesano, on 2011-02-01 12:07, wrote:

I attach a sample code which does not work.

import numpy as np
> import matplotlib.pyplot as plt
>
> #create function to plot plus random error
> x = np.linspace(0,3,100)
> y = np.sin(x)
> err = np.random.random(100)
>
> plt.errorbar(x,y, yerr=err, color='g',linestyle='None',xuplims=True)
> plt.show()

Hi Francesco,

> plt.errorbar(x,y, yerr=err, color='g',linestyle='None',xuplims=True)

I'm not sure what you're hoping to see, but you should either use
xerr with xuplims, or yerr with uplims.

best,

···

--
Paul Ivanov
314 address only used for lists, off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7

3

Hi Paul,

2011/2/1 Paul Ivanov <pivanov314@…287…>

I’m not sure what you’re hoping to see, but you should either use

xerr with xuplims, or yerr with uplims.

Thank you for the reply. As usually I checked everything except the correct one.
By the way, if one uses (by error) yerr and xuplims/xlolims or xerr and uplims/lolims, no error bar shows up. Is this a bug or a feature?

Cheers,
Fra